This paper presents some results of research on the diversity of the Theaceae in Pu Hoat Nature Reserve, Nghe An province, from May 2019 to February 2022. Total 41 species belonging to 9 genera of Theaceae family were collected and identified. There were 1 genera and 13 species found as new records for the plant list of Pu Hoat Naturre reserve, published in 2019. Plant resources of Theaceae comprised 21 species representing 51.22% of total species and falling into 6 group of uses, such as: medicinal plants, timber plants, ornamental plants, tea drink plants, oil plants, poison plants. Medicinal plants are the largest group with 14 species represent 66.67% of total of plant resources and 34.15% of total species. The Spectrum of Biology (SB) of the Theaceae in Pu Hoat is summarized, as follows: 26.83%Me + 70.73 %Mi + 2.44%Na. The family of Theaceae in Pu Hoat Nature Reserve is mainly comprised of the endemic and subendemic element (70.73%), Asian tropical element (21.95%), Northerm temperate elements (7.32%).

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In the world, about 60 species of yellow camellia have been recorded and about 50 species are known in Vietnam. Camellia vuquangensis and Camellia hatinhensis were discovered and announced in 2018 in Vu Quang National Park. These two species of yellow camellia are currently considered endemic in Ha Tinh and have not been recorded in other provinces. The present study described the morphological, ecological, distribution and regenerative characteristics of these two species of yellow camellia in Vu Quang National Park. Research results will contribute to proposing appropriate measures for conservation and development.

Spatholobus pulcher Dunn. (Fabaceae) is collected from Pu Hoat Natural Reserve, Nghe An Province and confirmed in this paper as a new record for the flora of Vietnam. The specimens are preserved in the Herbarium of the Institute of Ecology and Biological Resources (HN) Ha Noi, Vietnam. We built the key for 6 species of this genus in Vietnam. A detailed description, illustration, data on distribution, ecology and phenology of S. pulcher are provided. It differs distinctly from other species of Spatholobus in Vietnam by having hirsute abaxially surface of leaflets, 5 - 7 paired lateral veins of leaflet, acuminate apex of calyx lobes and 2-lobed apex of corolla standard.